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PIC16LC621A-04E/SS - 8-bit OTP MCU, 4MHz, 1.75KB EPROM | Microchip
PIC16LC621A-04E/SS

PIC16LC621A-04E/SS - 8-bit OTP MCU, 4MHz, 1.75KB EPROM | Microchip

The Microchip PIC16LC621A-04E/SS is an EPROM-based 8-bit CMOS microcontroller from the PIC16LC62x family, delivering 1.75 KB of one-time-programmable (OTP) program memory and 96 bytes of RAM in a 20-pin SSOP (5.30 mm body) package with a 4 MHz maximum clock input and 200 ns single-cycle instruction execution. What is an 8-bit OTP microcontroller? An 8-bit OTP MCU is a small, low-power RISC microcontroller that integrates CPU, non-volatile OTP program memory, RAM data memory, and digital peripherals on a single CMOS die. Within the broader hierarchy (8-bit microcontroller -> RISC microcontroller -> microcontroller -> embedded IC -> semiconductor), the PIC16LC62x sits at the lower end of Microchip's mid-range PIC16 architecture, designed for cost-sensitive, low-pin-count embedded control tasks where the firmware is finalized during development and not field-upgradable. Key features of the PIC16LC621A-04E/SS include a 14-bit instruction word with only 35 single-cycle instructions to learn (excluding program branches, which take two cycles), a two-level deep hardware stack, direct/indirect/relative addressing modes, seven or eight special-function hardware registers, and an integrated watchdog timer, power-on reset, and brown-out reset. The "LC" voltage class supports 2.5 V to 6.25 V operation, allowing both 3.3 V and 5 V rails, while the "04" suffix denotes the 4 MHz speed grade. The "E" suffix designates the extended industrial temperature range (-40 °C to +125 °C). The device architecture uses a Harvard-style separate program/data bus optimized for deterministic 200 ns instruction cycles, with a small but efficient interrupt structure. Twelve to thirteen GPIO pins share package pins with peripheral functions, and the on-chip RC oscillator option reduces external component count. Total I/O count and peripheral map vary slightly within the PIC16LC62x sub-family, but the 621A variant provides 12 I/O with analog comparator support. Typical applications include low-cost consumer appliances, sensor interface modules, simple motor and relay control, LED driving and indicator panels, battery-powered handheld instruments, and industrial automation edge nodes where 8-bit processing headroom and minimal BOM are more important than connectivity or DSP performance. When designing with this part, note that OTP memory cannot be reprogrammed in-circuit; for development cycles, use the windowed (JW) or flash-based PIC16F62x equivalent. Brown-out reset and watchdog timer configuration are controlled by configuration-word bits set during programming and cannot be changed at runtime. Always place a 0.1 µF decoupling capacitor within a few millimeters of VDD. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet, organized to help procurement and embedded engineers evaluate the PIC16LC621A-04E/SS quickly.

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PIC16LC621A-04I/P - 4MHz 8-bit OTP MCU 1.75KB | Microchip
PIC16LC621A-04I/P

PIC16LC621A-04I/P - 4MHz 8-bit OTP MCU 1.75KB | Microchip

The Microchip Technology PIC16LC621A-04I/P is an 8-bit EPROM/OTP-based CMOS microcontroller from the PIC16C family, featuring 1.75KB (1K x 14) of program memory, 96 bytes of RAM, and 13 I/O pins, all housed in an 18-pin PDIP (P) through-hole package. It operates at up to 4 MHz clock speed with a 200 ns single-cycle instruction execution time, supports a 2.5V to 6.25V supply voltage range, and offers 35 single-word instructions with a two-level deep hardware stack. An 8-bit microcontroller (MCU) is a small computer-on-a-chip that integrates a CPU, program memory, RAM, and peripherals into a single package. The PIC16C series uses a RISC-based Harvard architecture with 12-bit wide instructions and an 8-bit wide data path, which simplifies firmware development while delivering deterministic real-time response for embedded control. The PIC16LC621A belongs to the Microchip mid-range PIC16 family, occupying the low-power (LC) tier optimized for battery-operated and industrial applications where minimal quiescent current matters. Key features include an internal comparator with programmable reference, 13 digital I/O lines capable of sourcing/sinking 25 mA per pin, a watchdog timer with its own on-chip RC oscillator for reliable operation, and a power-on reset (POR) circuit. The device supports in-circuit serial programming (ICSP) via two pins, allowing firmware updates without removing the chip from the board, which is invaluable in field-deployed equipment. Two 8-bit timers plus one watchdog timer provide flexible event scheduling. The PIC16LC621A-04I/P uses a CMOS process with EPROM-based program memory, which makes it one-time-programmable (OTP). This is preferred in low-volume or industrial control applications where firmware is finalized in production and field updates are not expected. The LC variant (low-power CMOS) draws roughly half the operating current of the standard PIC16C621A, extending battery life in remote sensor nodes. Direct, indirect, and relative addressing modes give the compiler flexibility in code generation. Typical applications include industrial control logic, appliance controllers (washing machines, microwave ovens, HVAC), remote sensor interfaces, low-end automotive body modules, and general-purpose embedded control where simplicity, deterministic timing, and cost-effectiveness outweigh the need for larger memory. Its wide voltage range also suits battery-powered products. As a drop-in successor to older PIC16C621A-04/P designs, the LC variant is commonly specified for new low-power designs and legacy refresh programs. When designing with this part, ensure the system clock configuration matches the 4 MHz maximum for the -04 speed grade, and budget adequate supply decoupling (100 nF ceramic plus 10 uF bulk) close to VDD/VSS pins. The OTP memory means firmware must be fully validated before programming - there are no field re-program cycles. For higher memory or in-system re-programmability, consider the PIC16F family (Flash-based) as a future-proof migration path on the same 18-pin footprint. This page synthesizes distributor pricing from Mouser/DigiKey/LCSC, drop-in same-package alternatives, and practical engineering guidance not found in the manufacturer datasheet alone.

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PIC16LC621AT-04/SS - 8-Bit 4MHz OTP MCU 20-SSOP | Microchip
PIC16LC621AT-04/SS

PIC16LC621AT-04/SS - 8-Bit 4MHz OTP MCU 20-SSOP | Microchip

The Microchip Technology PIC16LC621AT-04/SS is an 8-bit RISC CMOS microcontroller from the PIC® 16C family, featuring 1.75KB (1K x 14) of One-Time-Programmable (OTP) program memory, 96 bytes of data RAM, and a maximum clock speed of 4 MHz, housed in a 20-pin SSOP package. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/Flash/OTP), working RAM, peripheral set, and I/O on one die; the PIC16LC621A belongs to the PIC16 mid-range 8-bit MCU family, which sits within the broader hierarchy: 8-bit microcontroller -> microcontroller -> embedded processor -> semiconductor. PIC mid-range cores use a 14-bit instruction word with an 8-bit data path, a two-level hardware stack, and Harvard architecture (separate program and data buses). The LC suffix designates the low-voltage CMOS variant optimized for 2.5V to 6.0V operation. Key features include 12 I/O pins, two analog comparators, one 8-bit timer (Timer0), a Watchdog Timer (WDT) for code-lock recovery, and an internal RC oscillator option. The OTP memory is programmed once using Microchip's ICSP (In-Circuit Serial Programming) interface and is retained for the life of the device. The part is offered in tape-and-reel packaging as the /SS SSOP-20 form factor. The PIC16LC621A uses a RISC-style core with only 35 single-word/single-cycle instructions (most are 1-cycle except branches), enabling predictable deterministic execution at 4 MHz (250 ns instruction cycle). Seven or eight Special Function Registers (SFRs) manage core state, and the device supports direct, indirect, and relative addressing modes. Two comparators can be software-routed to I/O pins for analog threshold detection. Typical applications include low-power embedded control, automotive body modules (with the extended-temperature -I/SS variant), industrial sensor interfaces, simple motor and relay drivers, and battery-operated consumer appliances. The LC voltage range also makes it suitable for 3.3V systems where a true 5V-only PIC would be inappropriate. Designers should note that the 'T' suffix indicates tape-and-reel packaging, '04' is the 4 MHz speed grade, and the LC family requires a regulated 2.5V-6.0V supply. OTP parts cannot be reprogrammed; choose the PIC16F621A Flash equivalent if in-field firmware updates are required.

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PIC16LC621AT-04E/SO - 8-Bit 4MHz OTP MCU, 1.75KB, 18-SOIC | Microchip
PIC16LC621AT-04E/SO

PIC16LC621AT-04E/SO - 8-Bit 4MHz OTP MCU, 1.75KB, 18-SOIC | Microchip

The Microchip PIC16LC621AT-04E/SO is an 8-bit EPROM/OTP-based CMOS microcontroller from the PIC16C family, operating at up to 4 MHz clock speed and housed in an 18-pin SOIC (SO) package. It integrates 1.75 KB of program memory (organized as 1K x 14) and 96 bytes of RAM (96 x 8), with a 12-bit wide instruction word and 8-bit wide data path. The supply voltage range is 2.5 V to 6.25 V, supporting both 3.3 V and 5 V designs. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory (ROM/EPROM/Flash), data memory (RAM), and peripheral interfaces such as timers, I/O ports, and communication modules. Within the semiconductor hierarchy, an MCU is a sub-class of embedded processor -> microprocessor -> digital IC. The PIC16LC621A specifically belongs to Microchip's mid-range PIC16 family, characterized by a 14-bit instruction set, two-level hardware stack, and Harvard-style separate program/data buses. Key features of the PIC16LC621AT-04E/SO include 13 I/O pins, seven or eight special function hardware registers, and direct, indirect, and relative addressing modes. It is rated for the automotive operating temperature range (per the 'E' designator) and uses One-Time Programmable (OTP) EPROM for code storage, making it suitable for low-to-medium volume production. The device supports Watchdog Timer, power-on reset, and sleep low-power modes typical of the PIC mid-range architecture. Technically, the PIC16LC621A employs a RISC instruction set with most instructions executing in a single instruction cycle (4 oscillator clocks). Its CMOS process yields low power consumption, and the 'LC' variant specifies a low-voltage (2.5 V minimum) operation, ideal for battery-backed or 3.3 V-only systems. The 18-SOIC package offers an industry-standard footprint compatible with hand-soldering and automated SMT assembly. Typical applications include automotive body controllers, low-end sensor interfaces, appliance controls, and industrial logic replacement. The OTP memory is well-suited to mature, stable firmware where field re-programmability is not required. A key design consideration is that the 'A' suffix denotes an enhanced silicon revision; engineers should confirm register-level compatibility with older PIC16C621 firmware. OTP parts cannot be reprogrammed, so emulator or flash-based PIC16F621 prototypes are recommended during development. This page synthesizes distributor stock data, parametric alternatives, and practical design notes not aggregated in a single place on the manufacturer datasheet, enabling faster engineering and procurement decisions.

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PIC16LC621AT-04E/SS - 8-Bit OTP MCU, 4MHz, 1.75KB | Microchip
PIC16LC621AT-04E/SS

PIC16LC621AT-04E/SS - 8-Bit OTP MCU, 4MHz, 1.75KB | Microchip

The Microchip Technology PIC16LC621AT-04E/SS is an 8-bit EPROM-based CMOS microcontroller from the PIC16C family, featuring a 4MHz instruction cycle, 1.75KB (1K x 14) of One-Time Programmable (OTP) program memory, and 96 bytes of RAM in a 20-pin SSOP package. The 'LC' prefix designates the low-voltage (2.5V-6.25V) variant, while the '04' indicates the 4MHz maximum clock speed and 'T' denotes the tape-and-reel packaging format. The 'E' suffix marks the extended (industrial) temperature grade. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and I/O peripherals on one die. The PIC16LC621AT belongs to the EPROM/OTP branch of the PIC16 mid-range architecture, which uses a 14-bit wide instruction set with separate 8-bit data paths, a two-level deep hardware stack, and direct/indirect/relative addressing. The PIC16 family sits within Microchip's broader PIC microcontroller hierarchy (PIC10/12/16/18/24/32) and is one of the longest-running 8-bit MCU lines in the industry. Key features of this device include 12 I/O pins, two 8-bit timer/counters, a watchdog timer, Power-On Reset (POR), Brown-out Detect/Reset, and a programmable code protection mechanism. The OTP program memory allows one-time field programming via standard PIC programmers, making the device well suited to low-volume production runs where mask-ROM volume is not justified. With 12-bit wide instructions and 35 single-word instructions, the core delivers predictable deterministic execution at 250 ns per instruction at 4MHz. Typical applications include low-cost consumer appliances, sensor signal conditioning front-ends, simple motor control loops, automotive body electronics (non-safety), remote-control transmitters, and battery-powered instruments where the wide 2.5V-6.25V supply range provides flexibility across 3.3V and 5V rails. The extended temperature grade permits operation from -40C to +125C, fitting industrial and automotive underhood environments. When designing with this part, note that OTP memory cannot be erased - firmware must be fully validated before programming. The device is in production but has been superseded in many designs by the Flash-based PIC16F628 (pin-compatible upgrade path), and the PIC16LC621AT remains the preferred choice only when OTP cost advantages or security requirements matter. This page synthesizes distributor stock and pricing data, drop-in compatible alternatives in the 20-SSOP footprint, and practical design notes not collected in a single place in the manufacturer datasheet, helping procurement and design engineers shortlist compatible parts faster.

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PIC16LC621AT-04I/SO - 8-Bit 4MHz OTP MCU 18-SOIC | Microchip
PIC16LC621AT-04I/SO

PIC16LC621AT-04I/SO - 8-Bit 4MHz OTP MCU 18-SOIC | Microchip

The Microchip Technology PIC16LC621AT-04I/SO is an 8-bit RISC microcontroller from the PIC16C family, featuring 1.75 KB (1K x 14) of One-Time Programmable (OTP) program memory, 96 bytes of RAM, and a 4 MHz instruction-cycle clock. The 'LC' prefix denotes the low-power CMOS variant, allowing operation across a 2.5V to 6.25V supply range from a single 18-pin SOIC (SO-18, 0.300-inch wide) package. The 'T' suffix indicates tape-and-reel packaging, while 'I' marks the industrial operating temperature range of -40C to +85C. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral I/O on one die. The PIC16C family uses a RISC Harvard architecture with separate program and data buses, a fixed 12-bit-wide instruction word, an 8-bit-wide data path, two-level deep hardware stack, and seven/eight special function registers. Direct, indirect, and relative addressing modes are supported. As part of the broader hierarchy, this PIC16 MCU sits under: microcontroller -> embedded MCU -> microprocessor-based system -> semiconductor. Synonyms: MCU, microcontroller unit, embedded controller. Key features include 13 general-purpose digital I/O pins (12 I/O ports per datasheet overview), a 4 MHz internal/external oscillator option, low-power CMOS construction with typical sleep currents in the microamp range, and an on-chip watchdog timer for safety-critical embedded control. The OTP program memory allows one-time field programming using standard PIC development tools, which is well-suited to mature production designs where code is finalized. The architecture is built around a 14-bit instruction set optimized for compact code density, allowing simple control loops, state machines, and peripheral driving tasks to fit in the small 1K instruction-word memory. Brown-out reset, power-on reset, and a programmable code-protect bit are provided. The '04' speed grade (4 MHz) is the lowest clock speed in the family and yields the lowest dynamic power consumption. Typical applications include appliance control (washing machines, microwave ovens, HVAC fan control), industrial sensor interfaces, low-cost remote controls, automotive interior subsystems (non-safety), battery-powered metering, and consumer white goods. The wide 2.5-6.25V supply tolerance makes the part tolerant of unregulated wall-adapter rails. When designing with this device, pay attention to the OTP nature of program memory - firmware must be fully validated before programming because re-programming in-circuit is not possible. A 100 nF decoupling capacitor placed within 5 mm of VDD and a 10-100 uF bulk capacitor on the supply rail are recommended. MCLR must be pulled high through a 10 kohm resistor for normal operation. This page synthesizes distributor pricing from DigiKey, Mouser, LCSC, and Octopart, cross-references drop-in same-package alternatives from the PIC16C621A family, and provides practical design notes not consolidated in the manufacturer datasheet alone.

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PIC16LC621AT-04I/SS - 8-Bit 4MHz OTP MCU 1.75KB 20-SSOP | Microchip
PIC16LC621AT-04I/SS

PIC16LC621AT-04I/SS - 8-Bit 4MHz OTP MCU 1.75KB 20-SSOP | Microchip

The Microchip Technology PIC16LC621AT-04I/SS is an 8-bit RISC microcontroller from the PIC® 16C family, featuring 4 MHz CPU clock speed, 1.75 KB (1K x 14) of One-Time Programmable (OTP) program memory, and 96 bytes of RAM in a 20-pin SSOP package with industrial -40C to +85C operating range. The device integrates 13 general-purpose I/O pins, a 2-level deep hardware stack, and core peripherals including Brown-out Detect (BOD), Power-On Reset (POR), and Watchdog Timer (WDT), supporting operation from 2.5 V to 6.25 V supply rails. A PIC microcontroller (MCU) is a compact, self-contained computer-on-a-chip combining an 8-bit CPU, non-volatile program memory (here, OTP), volatile RAM, and configurable I/O peripherals on a single die. PIC MCUs sit in the broader hierarchy of embedded controllers -> microcontrollers -> 8-bit microcontrollers -> RISC microcontrollers -> semiconductors, and are widely used in cost-sensitive consumer and industrial control products. The 'C' in PIC16C indicates an OTP EPROM-based program memory architecture, distinguishing it from flash-based PIC16F variants. Key features of the PIC16LC621AT-04I/SS include 12-bit wide instruction set with an 8-bit data path, seven or eight special function hardware registers, direct/indirect/relative addressing modes, and CMOS low-power technology supporting the wide 2.5 V to 6.25 V supply range. The /SS suffix denotes the 20-pin SSOP (Shrink Small Outline Package) form factor, and the '04' speed grade specifies 4 MHz maximum clock. The 'I' industrial temperature grade supports -40C to +85C ambient operation. According to the Microchip datasheet, this part belongs to the mid-range PIC16C6xx family and is suitable for products where one-time programmable memory and a small footprint are acceptable. Typical applications span white goods and small appliance controllers, automotive body electronics (non-AEC-Q100), simple sensor interfaces, consumer remote controls, low-end timer/sequencer logic, and replacement of discrete logic in cost-optimized designs. For applications requiring in-system reprogrammability, designers should migrate to a flash-based PIC16F equivalent instead. The 20-SSOP package offers a compact 0.209 inch (5.30 mm) body width for high-density board layouts. When designing with this device, carefully verify that OTP programming is acceptable for your production flow, since OTP parts cannot be erased or rewritten. Plan for adequate supply decoupling and ensure the WDT is enabled or disabled intentionally per the application requirement. According to the Microchip datasheet, the PIC16LC621A family is mature and may be subject to lifecycle transitions; verify current availability with Microchip before committing to new designs.

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PIC16LC621T-04/SO - 8-Bit PIC MCU, 4MHz, 1.75KB OTP | Microchip
PIC16LC621T-04/SO

PIC16LC621T-04/SO - 8-Bit PIC MCU, 4MHz, 1.75KB OTP | Microchip

The Microchip Technology PIC16LC621T-04/SO is an 8-bit PIC microcontroller from the PIC16C family, operating at 4 MHz and delivering 1.75 KB (1K x 14) of One-Time Programmable (OTP) program memory and 80 bytes of RAM in an 18-pin SOIC package. Tape-and-reel packed for high-volume assembly, the device targets low-cost, low-power embedded control in industrial, automotive and consumer applications where deterministic 8-bit RISC performance is sufficient. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and configurable I/O peripherals. The PIC16C family from Microchip is built on a Harvard-architecture RISC core with separate program and data buses, 12-bit-wide instructions and an 8-bit-wide data path. Inside the PIC16LC621 the core is paired with seven (or eight) special-function hardware registers, a two-level-deep hardware stack, and direct/indirect/relative addressing modes that map efficiently onto compiled C and assembly source. Key features include a 4 MHz maximum clock, 12 CMOS-compatible I/O lines, OTP program memory suited to fixed-code production runs, internal oscillator support, and power-saving SLEEP mode. The 'LC' supply range of 2.5 V to 6.25 V lets the part run directly from a 3.3 V or 5 V rail without a separate regulator. Compared with flash-based PIC16F parts, the OTP variant reduces unit cost in mature, code-stable products where in-field firmware updates are not required. Typical applications include appliance controls, sensor signal conditioning, low-end remote keyless entry transmitters, automotive body modules, and simple logic-replacement glue. The 18-SOIC footprint remains popular for through-hole-free board designs that migrate from DIP-18 prototypes. When designing with this device, observe the maximum clock versus supply-voltage derating in the datasheet, keep RESET/MCLR decoupling tight, and reserve the OTP programmer footprint on first-article builds. Migration to the flash-based PIC16F627 (same pinout) is recommended for new designs that need firmware iteration. This page synthesises distributor pricing, drop-in same-package alternatives, and engineering design notes for the PIC16LC621T-04/SO that are not found in a single manufacturer datasheet.

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PIC16LC621T-04/SS - 8-Bit 4MHz OTP MCU, 1.75KB | Microchip
PIC16LC621T-04/SS

PIC16LC621T-04/SS - 8-Bit 4MHz OTP MCU, 1.75KB | Microchip

The Microchip Technology PIC16LC621T-04/SS is an 8-bit EPROM/OTP-based CMOS microcontroller from the PIC16C family, operating at up to 4 MHz with 1.75 KB (1K x 14) of one-time programmable program memory. Housed in a 20-pin SSOP (5.30 mm) surface-mount package, it offers 13 I/O pins, supports a supply voltage range of 2.5 V to 6.0 V, and is rated for 0 °C to +70 °C commercial ambient operation. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, RAM, and programmable peripherals. The PIC16LC621 belongs to the mid-range PIC16 family — a Harvard-architecture RISC controller that executes one instruction per cycle (except branches) and uses a 14-bit instruction word with an 8-bit data path. Within the broader taxonomy, this part sits between simple PIC10/PIC12 8-pin devices and higher-pin-count PIC18/PIC24 parts, optimized for cost-sensitive embedded control. Key features include 13 general-purpose digital I/O pins, a Watchdog Timer (WDT) for code-flow integrity, Power-On Reset (POR), Brown-out Detect/Reset (BOR) for safe operation across fluctuating supplies, and a two-level hardware stack. The device is fabricated on a low-power CMOS process, allowing deep sleep modes for battery-friendly applications, and supports both 3.3 V and 5 V operation. Integrated peripherals include a Timer0 8-bit counter/timer with programmable prescaler, and analog comparators suitable for sensor interfaces. The PIC16LC621 uses a RISC core with 35 single-word instructions, two-level deep hardware stack, and seven special function hardware registers. Direct, indirect, and relative addressing modes are supported. The 'LC' suffix indicates the low-voltage CMOS variant, optimized for operation down to 2.5 V, while the 'T' tape-and-reel suffix and '04' speed grade denote 4 MHz operation in surface-mount shipping format. Typical applications include low-cost consumer appliances, sensor interface modules, simple motor-control driver boards, LED lighting controllers, IR remote-control transmitters/receivers, and battery-powered portable instruments. The 13-I/O count and small SSOP-20 footprint suit designs where PCB area is constrained but digital I/O and basic analog comparator functions are required. When designing with this part, note that OTP memory can be programmed only once — production units must be pre-programmed or use the equivalent Flash-based PIC16F62X family for iterative development. Ensure decoupling capacitors are placed close to VDD/VSS, and that the MCLR reset pin is pulled high through a proper resistor for reliable startup. This page synthesizes distributor pricing, drop-in pin-compatible alternatives (same SSOP-20 footprint), and practical engineering notes not found in the manufacturer datasheet alone.

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PIC16LC621T-04E/SO - 8-Bit PIC MCU, 4MHz, 1.75KB OTP, 18-SOIC | Microchip
PIC16LC621T-04E/SO

PIC16LC621T-04E/SO - 8-Bit PIC MCU, 4MHz, 1.75KB OTP, 18-SOIC | Microchip

The Microchip Technology PIC16LC621T-04E/SO is an 8-bit CMOS PIC microcontroller from the PIC® 16C family with 1.75KB (1K x 14) of One-Time Programmable (OTP) program memory and 80 bytes of RAM, housed in an 18-pin SOIC package. The device operates at a 4MHz clock speed and targets low-cost, low-power embedded control applications requiring simple I/O expansion and basic computational tasks. What is a PIC microcontroller? A PIC microcontroller (Peripheral Interface Controller) is a family of microcontrollers manufactured by Microchip Technology, built on a Harvard architecture with separate program and data buses. The 16C sub-family was an early OTP-based series, predating the flash-based PIC16F series. PIC microcontrollers integrate a CPU core, program memory (ROM/OTP/Flash), data RAM, EEPROM, and a configurable set of peripherals (I/O, timers, ADC, comparators) into a single IC, making them self-contained embedded controllers for products that need deterministic real-time behavior. Key features of the PIC16LC621T-04E/SO include 13 I/O pins, Brown-out Detect/Reset (BOD), Power-On Reset (POR), Watchdog Timer (WDT), and an externally driven oscillator. The 'LC' voltage class supports an operating voltage range typically from 2.5V to 6.25V, enabling battery and 5V-rail designs. The 18-SOIC (SO) package is the standard 0.300" wide SOIC body, well suited to hand-soldering and moderate-density PCB layouts. The device uses a 12-bit instruction word with an 8-bit data path, seven or eight special function hardware registers, and a two-level deep hardware stack. Direct, indirect, and relative addressing modes are supported. Combined with its 4MHz maximum clock, the architecture delivers predictable instruction timing suitable for small-loop control, sensor interfacing, and appliance-grade logic replacement. Typical applications include simple appliance controls, sensor signal conditioning front-ends, LED indicator drivers, low-cost consumer remote controls, and industrial logic-replacement circuits. With 80 bytes of RAM and OTP program memory, the device fits tightly-scoped tasks where in-field re-programmability is not required. When designing with this OTP part, plan code carefully before programming because OTP cannot be erased or rewritten. Ensure the watchdog timer is correctly configured in software to recover from fault conditions, and validate brown-out reset threshold behavior across your supply tolerance. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes for the PIC16LC621T-04E/SO, complementing the Microchip datasheet with engineering context not available on standalone product pages.

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PIC16LC621T-04I/SO - 8-Bit 4MHz OTP MCU 1.75KB | Microchip
PIC16LC621T-04I/SO

PIC16LC621T-04I/SO - 8-Bit 4MHz OTP MCU 1.75KB | Microchip

The Microchip Technology PIC16LC621T-04I/SO is an 8-bit PIC® mid-range microcontroller with 4 MHz maximum clock speed, 1.75 KB (1K x 14) OTP program memory, and 80 bytes of RAM, housed in an 18-pin SOIC package. It operates from 2.5 V to 6.25 V across the industrial temperature range (-40 °C to +85 °C) and provides 12 digital I/O pins. The device belongs to the legacy PIC16C OTP family designed for cost-sensitive, high-volume embedded applications where code is finalized at production time. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data memory, and I/O peripherals on one die. MCUs sit within the broader semiconductor hierarchy as a subcategory of microprocessors, alongside digital signal processors (DSPs), microcontrollers (MCUs), and application processors. The PIC16C family specifically targets low-cost general-purpose control with a RISC-based 12-bit instruction word and 8-bit data path. LC variants use CMOS technology for low power consumption, while the 621 sub-family adds a comparator peripheral for analog signal conditioning. Key features include a two-level deep hardware stack, direct/indirect/relative addressing modes, seven or eight special function hardware registers, an internal oscillator option, and a programmable code-protection mechanism. The 18-pin SOIC (SO) package provides 0.295 in (7.50 mm) body width suitable for hand-soldering and standard SMT lines. The 04 speed grade denotes 4 MHz maximum oscillator frequency, and the LC process node enables typical active current around 2 mA at 5 V and 4 MHz. Typical applications include appliance control modules, low-end consumer electronics, IR remote controls, sensor interfaces, and battery-powered toys. The integrated analog comparator simplifies proximity-sensor and battery-monitor front-ends without requiring an external op-amp. The OTP memory makes the part appropriate for mature products where firmware no longer requires in-field updates. When designing with this part, account for OTP memory constraints: code must be 100 % verified before programming because OTP cannot be erased or rewritten. The 80-byte RAM limits stack depth and buffer-heavy algorithms, so designers should avoid large lookup tables or recursions in firmware planning.

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PIC16LC621T-04I/SS - 4MHz 8-Bit OTP MCU, 20-SSOP | Microchip
PIC16LC621T-04I/SS

PIC16LC621T-04I/SS - 4MHz 8-Bit OTP MCU, 20-SSOP | Microchip

The Microchip Technology PIC16LC621T-04I/SS is an 8-bit PIC® 16C-series microcontroller operating at 4MHz with 1.75KB (1K x 14) of OTP program memory and 80 bytes of RAM, housed in a 20-pin SSOP package rated for the industrial -40C to +85C range. The 'LC' family designation indicates a low-power CMOS variant designed for battery and energy-constrained applications, supporting supply voltages from 2.5V to 6.25V. The 'T' suffix marks tape-and-reel packaging and '04' denotes the 4MHz maximum clock rate, with 'I' specifying industrial temperature grade. An 8-bit microcontroller (MCU) is a single-chip computer integrating a CPU, program memory, RAM, and peripherals onto one die. The PIC 16C architecture belongs to the broader RISC microcontroller family within the wider microcontroller -> embedded processor -> semiconductor taxonomy. 8-bit MCUs remain the workhorses of low-cost embedded control because they offer deterministic instruction execution, very low quiescent current, and a mature toolchain. The 'LC' suffix identifies the low-voltage, low-power process node used by this device, optimized for designs previously served by discrete logic or earlier PIC12/PIC16 baselines. Key features of the PIC16LC621T-04I/SS include 12 to 13 general-purpose digital I/O pins (sources vary slightly), a two-level deep hardware stack, seven or eight special-function hardware registers, and direct/indirect/relative addressing modes. The instruction word is 14 bits wide while the data path is 8 bits wide, a hallmark of mid-range PIC devices. Brown-out Detect/Reset, Power-On Reset (POR), and a Watchdog Timer (WDT) are integrated on-chip, allowing the device to recover from low-voltage brown-out events and runaway code without external supervisory components. The PIC 16C core is a Harvard-architecture RISC processor: separate program and data buses permit simultaneous instruction fetch and data access. Each instruction executes in a single instruction cycle (four oscillator clocks), which simplifies deterministic timing analysis. The device requires an external oscillator and offers flexible clock source selection, enabling the designer to trade EMI, cost, and power consumption by choosing RC, crystal, or resonator timing references. Typical applications for the PIC16LC621T-04I/SS include industrial control logic, appliance and white-goods subsystems, simple sensor interfaces, automotive body controllers (non-safety), remote controls, and battery-powered instrumentation. Its OTP memory makes it well-suited to high-volume, cost-sensitive products where firmware is finalized at production. A key design consideration is that OTP (One-Time Programmable) memory cannot be reprogrammed in-circuit; prototypes should be developed on the windowed (JW) or UV-erasable variant or a pin-compatible Flash device such as the PIC16F baseline. Designers should also budget for the external RC or crystal oscillator components required by this device. This page synthesizes distributor pricing, pin-compatible drop-in alternatives, lifecycle status, and practical design notes not found on the manufacturer datasheet's first page.

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PIC16LC622-04/SS - 4MHz 8-bit OTP MCU 3.5KB | Microchip
PIC16LC622-04/SS

PIC16LC622-04/SS - 4MHz 8-bit OTP MCU 3.5KB | Microchip

The Microchip Technology PIC16LC622-04/SS is a low-power 8-bit CMOS microcontroller based on the PIC16C family RISC architecture, delivering 4 MHz maximum clock speed, 3.5 KB of OTP program memory (2K x 14), and 128 bytes of RAM in a 20-pin SSOP package. It operates from a 2.5V to 6.25V supply rail and exposes 13 digital I/O lines for general-purpose use, making it suitable for cost-sensitive embedded control in commercial temperature grades. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, RAM, and peripheral interfaces into one IC. Within the broader semiconductor taxonomy, an 8-bit MCU like the PIC16LC622 sits below 16-bit and 32-bit MCUs in computational capability but excels in deterministic real-time response, ultra-low power, and low unit cost. It belongs to the power management and embedded control hierarchy of mixed-signal semiconductors, often deployed as the decision-making core of consumer appliances, sensor nodes, and battery-powered instruments. Key features of the PIC16LC622-04/SS include 12-bit wide instructions, an 8-bit wide data path, seven or eight special-function hardware registers, a two-level deep hardware stack, and direct/indirect/relative addressing modes. It also integrates a watchdog timer, power-on reset, and brown-out detect for embedded robustness. The '04' suffix indicates a 4 MHz maximum oscillator frequency, while the 'SS' suffix denotes the 20-pin SSOP (Shrink Small Outline Package). Architecturally, the device uses Microchip's classic RISC core with a single accumulator (W register) and a Harvard-style memory map separating program and data spaces. The OTP (One-Time Programmable) memory provides non-volatile code storage at the lowest die cost, contrasting with flash-based 'F' variants. Its CMOS design keeps quiescent current low enough to operate from batteries, and the SSOP-20 footprint is among the smallest 20-pin PIC packages, enabling compact PCB designs. Typical applications include remote-control transmitters, small appliance controllers, LED lighting drivers, simple sensor interfaces, and battery-powered consumer devices. The PIC16LC622-04/SS is also commonly used in educational development boards and as a baseline 8-bit platform for learning embedded C or assembly. When designing with this part, note that the OTP memory cannot be reprogrammed; for prototyping, prefer the flash-based PIC16F equivalent (e.g., PIC16F627/628). The 4 MHz speed is suitable for bit-banged protocols and slow UART up to ~9600 baud, but reserve higher-speed tasks for parts with USART hardware. Always include proper decoupling and follow Microchip's ICD programming pinout for in-circuit debug where applicable. This page synthesizes distributor pricing, OTP/Flash drop-in alternatives, and practical design notes not found in the standalone Microchip datasheet, helping engineers select the right variant for new designs and legacy maintenance.

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PIC16LC622-04E/P - 4MHz 8-Bit CMOS MCU, 3.5KB OTP | Microchip
PIC16LC622-04E/P

PIC16LC622-04E/P - 4MHz 8-Bit CMOS MCU, 3.5KB OTP | Microchip

The Microchip PIC16LC622-04E/P is an EPROM-based 8-bit CMOS microcontroller from the PIC16C family, delivering 4 MHz CPU performance with 3.5 KB (2K x 14) of One-Time-Programmable (OTP) program memory in an 18-pin PDIP through-hole package. It operates from a 2.5 V to 6.0 V supply and supports the industrial temperature range of -40 °C to +125 °C, making it suitable for ruggedized environments and long-lifecycle industrial systems. The device features a RISC architecture with only 35 single-cycle instructions (200 ns instruction cycle at 4 MHz) and a two-level deep hardware stack. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (ROM/RAM), and programmable I/O peripherals. The PIC16LC622 belongs to the 8-bit microcontroller family -> CMOS microcontroller -> embedded controller -> semiconductor hierarchy. The "LC" prefix designates the low-power CMOS variant of the PIC16C62x series, optimized for battery-friendly operation. The device uses Harvard architecture with 12-bit wide instructions and an 8-bit data path, and offers direct, indirect, and relative addressing modes with seven or eight special-function hardware registers. Key features include 12 general-purpose I/O pins capable of driving LED loads directly, on-chip power-on reset, watchdog timer, brown-out reset (on some variants), and an 8-bit timer/counter. The OTP program memory allows factory or one-time field programming, which is useful for low-volume or fixed-function production runs where in-system reprogrammability is not required. Compared to flash-based PIC16F parts, the OTP C-variant is typically lower cost per unit at higher volumes but cannot be re-programmed in-circuit. Typical applications include industrial automation controllers, consumer electronics front panels, motor control interfaces, HVAC thermostat logic, and legacy replacement of older PIC16C62x designs. The wide 2.5 V–6.0 V supply range simplifies integration into both 3.3 V and 5 V rails without level shifting. The 04 speed grade indicates 4 MHz maximum clock; the "E" suffix denotes the extended industrial temperature range. When designing with this part, ensure that the program memory type (OTP vs Flash) matches the production programming model, since OTP parts cannot be reprogrammed in-circuit. For new designs, consider the pin-compatible flash-based PIC16F628 or PIC16F84A family for in-system reprogrammability; the LC622 is generally preferred as a long-lifecycle drop-in for legacy systems. Decoupling capacitors (100 nF) should be placed within 5 mm of VDD/VSS pins, and unused I/O should be configured as outputs low to minimize current draw.

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PIC16LC622-04E/SO - 8-Bit 4MHz 3.5KB OTP MCU 18-SOIC | Microchip
PIC16LC622-04E/SO

PIC16LC622-04E/SO - 8-Bit 4MHz 3.5KB OTP MCU 18-SOIC | Microchip

The Microchip Technology PIC16LC622-04E/SO is an 8-bit CMOS microcontroller from the PIC 16C family, offering 4 MHz CPU clock, 3.5 KB (2K x 14) One-Time Programmable (OTP) program memory and 128 bytes of RAM in an 18-pin SOIC (SO) surface-mount package. The device is designed for low-voltage embedded control and operates from a 2.5 V to 6.25 V supply, suiting battery-powered and 5 V industrial designs alike. A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and peripheral I/O on one die. PIC microcontrollers use a RISC Harvard architecture with a separate program and data bus, which simplifies instruction fetching and lets the core execute most instructions in a single clock cycle. The PIC16C/LC62x family specifically targets cost-sensitive applications with moderate code size (2K-4K instructions) and a small 18-pin footprint, sitting below the larger PIC16C7x family in Microchip's lineup. Key features of the PIC16LC622 include a 12-bit instruction word with an 8-bit data path, a two-level hardware stack, seven or eight special-function hardware registers, and 12 digital I/O pins. Peripherals include a watchdog timer, power-on reset, brown-out reset, and a Capture/Compare/PWM (CCP) module. The 4 MHz oscillator supports a 1 microsecond instruction cycle, which is sufficient for slow control applications such as appliance control, sensor interfaces, and simple human-machine interface logic. Typical applications for the PIC16LC622-04E/SO include low-cost remote controls, small sensor nodes, automotive body controllers, security peripherals, and any 5 V embedded design where cost-per-unit is the primary driver and on-chip flash is not required. The 18-SOIC package is widely accepted by assembly lines and supports hand-solder rework for prototypes. When migrating designs to flash-based parts, designers typically transition to the PIC16F62x family, which adds in-circuit serial programming and many additional peripherals while keeping the same 18-pin footprint. Always verify pin compatibility on a per-pin basis because some peripherals are mapped differently between OTP and flash variants.

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PIC16LC622-04E/SS - 4MHz 8-Bit EPROM MCU 20-SSOP | Microchip
PIC16LC622-04E/SS

PIC16LC622-04E/SS - 4MHz 8-Bit EPROM MCU 20-SSOP | Microchip

The Microchip Technology PIC16LC622-04E/SS is an EPROM-based 8-bit CMOS microcontroller from the PIC16C family, delivering 4 MHz core speed in a 20-pin SSOP package. The device integrates 3.5 KB (2K x 14) of One-Time Programmable (OTP) program memory, 128 bytes of data RAM, and 13 general-purpose I/O pins. Operating from a 2.5 V to 6.25 V supply, the part is engineered for low-power embedded control in commercial and industrial environments. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/EPROM/flash), data RAM, and peripheral I/O on one die, executing instructions stored in non-volatile memory and manipulating variables in scratchpad RAM. The PIC16C/LC family sits in the broader taxonomy: 8-bit microcontroller -> microcontroller -> embedded processor -> semiconductor IC. The 'LC' variant denotes the low-voltage CMOS process, optimized for battery and energy-constrained applications where the standard PIC16C would exceed its minimum VDD. Key features include 35 single-cycle instructions with 200 ns instruction cycle time at 20 MHz oscillator, a two-level deep hardware stack, and direct/indirect/relative addressing. Integrated peripherals comprise Brown-out Detect/Reset (BOD), Power-On Reset (POR), and Watchdog Timer (WDT) with its own on-chip RC oscillator for reliable operation without external supervision. Seven or eight special-function hardware registers give the part the deterministic interrupt response that defines PIC architecture. Architecturally, the PIC16LC622 uses a 12-bit wide instruction word and an 8-bit data path with a Harvard topology that fetches instruction and data in a single cycle, which is the source of its 200 ns cycle performance at 20 MHz. The OTP EPROM memory allows factory or field programming for small-to-medium volume production where flash reprogrammability is not required. Typical applications include low-power remote sensors, automotive body electronics, appliance controls, security keypads, and simple human-machine interface panels where deterministic response, low quiescent current, and small footprint outweigh the absence of in-system reprogrammability. When designing with this part, ensure VDD decoupling of 100 nF close to the pin, and note that the OTP windowed ('JW') package variant must be exposed to UV for erase - production boards should specify the OTP-only SSOP variant. The 'E' suffix denotes the industrial operating temperature range. This page synthesizes distributor stock data, same-package drop-in alternatives (including the PIC16LC622A upgrade), and practical design notes not found in the standalone manufacturer datasheet.

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PIC16LC622-04I/P - 4MHz 8-Bit CMOS MCU, 3.5KB OTP | Microchip
PIC16LC622-04I/P

PIC16LC622-04I/P - 4MHz 8-Bit CMOS MCU, 3.5KB OTP | Microchip

The Microchip Technology PIC16LC622-04I/P is an 8-bit CMOS EPROM-based microcontroller (MCU) belonging to the PIC® 16C family, operating at up to 4 MHz clock speed with 3.5 KB (2K x 14) of One-Time-Programmable (OTP) program memory, 128 bytes of RAM, and 13 I/O pins, housed in a 18-pin PDIP (0.300 inch, 7.62 mm) through-hole package. An 8-bit microcontroller is a single-chip computer built around an 8-bit data path, integrating a CPU, RAM, non-volatile program memory, and peripherals such as timers, interrupts, and I/O ports on a single die. The PIC16LC622 sits within the broader taxonomy as: microcontroller -> 8-bit MCU -> PIC16 family -> PIC16C sub-family -> CMOS EPROM-based device -> semiconductor IC. This LC variant is the low-power CMOS process version (vs. the PIC16C622 EPROM die), typically offering wider operating voltage and lower quiescent current than the original PIC16C62x parts. Key features of the PIC16LC622-04I/P include 12-bit wide instructions, an 8-bit wide data path, seven or eight special-function hardware registers, a two-level deep hardware stack, and direct, indirect, and relative addressing modes. The '04' speed grade indicates 4 MHz maximum oscillator input, and the 'I' suffix denotes the industrial temperature range of -40 °C to +85 °C. Supply voltage is specified at 2.5 V to 6.25 V, enabling operation from two or three alkaline cells up to a regulated 5 V rail. Architecturally, the PIC16LC622 is built on Microchip's classic Harvard RISC core, which fetches instructions from program memory on a separate bus from data, allowing most instructions to execute in a single instruction cycle (4 oscillator clocks). The OTP program memory means the firmware is permanently written once at programming time and cannot be electrically erased, making this part a cost-optimized choice for mature, stable production designs rather than iterative prototyping. Typical applications include low-power and cost-sensitive embedded control such as consumer appliances, automotive body electronics (interior lighting, seat controllers, small sensor interfaces), industrial control (sensor signal conditioning, simple closed-loop control), battery-powered instrumentation, and remote-control transmitters. The 13 I/O pins are sufficient for driving LEDs, reading buttons, communicating via UART or I²C through software bit-banging, and interfacing low-speed analog signals. When designing with this device, ensure the chosen oscillator or resonator is within the 4 MHz maximum and that decoupling capacitors are placed close to VDD/VSS pins. Because OTP parts cannot be re-programmed, developers typically use a windowed (JW) or flash equivalent for code development and switch to the OTP 'P' (PDIP) variant for production runs.

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PIC16LC622-04I/SO - 8-bit OTP MCU, 4MHz, 18-SOIC | Microchip
PIC16LC622-04I/SO

PIC16LC622-04I/SO - 8-bit OTP MCU, 4MHz, 18-SOIC | Microchip

The Microchip PIC16LC622-04I/SO is an EPROM-based 8-bit CMOS microcontroller from the PIC16C family, operating at up to 4 MHz with a 200 ns instruction cycle. It integrates 3.5KB (2K x 14) of OTP program memory and 128 bytes of RAM, has 13 I/O pins, and is housed in an 18-pin SOIC package. An 8-bit microcontroller (MCU) is a single-chip computer that contains a CPU, RAM, non-volatile program memory (ROM/EPROM/Flash), and I/O peripherals on one die. The PIC16C family represents Microchip's classic mid-range architecture, with the PIC16LC622 positioned between the smaller PIC16C55x/56x and the larger PIC16C6x/7x devices, offering a balance of OTP memory size and I/O capability. The 'L' prefix indicates a low-voltage (2.5V-6.25V) CMOS part suitable for battery-powered and 3.3V/5V mixed systems. Key features of the PIC16LC622-04I/SO include 35 single-cycle instructions (only program branches are two-cycle), a 12-bit-wide instruction word with an 8-bit-wide data path, seven or eight special-function hardware registers, a two-level deep hardware stack, and direct, indirect, and relative addressing modes. The 4 MHz clock input and 200 ns instruction cycle enable deterministic control loop execution. The 'I' suffix denotes the industrial temperature grade (-40C to +85C), and the /SO suffix denotes the surface-mount 18-pin SOIC package. The internal architecture combines a Harvard-style separate program and data buses, a precision 4 MHz internal oscillator option (depending on configuration), and built-in peripherals such as timers and a watchdog timer. Compared with later PIC16F Flash parts, the PIC16LC622 uses one-time-programmable (OTP) EPROM, which is appropriate for low-volume production or mature production runs where code stability outweighs in-field reprogrammability. Typical applications include industrial control logic, low-cost consumer appliance controllers, sensor signal pre-processing, simple motor-control sequencers, and legacy system retrofits that require pin-compatibility with earlier PIC16C sockets. The 2.5V-6.25V supply range supports operation directly from a 3.3V regulated rail or from a 5V USB/BUS supply. When designing with this device, ensure the OTP program memory is programmed before final PCB assembly in production, since OTP parts cannot be re-programmed in-circuit. For new designs where in-field firmware updates may be required, prefer a Flash-based PIC16F equivalent such as the PIC16F648A or PIC16F88, which use the same mid-range instruction set and offer similar peripheral sets with re-programmability.

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PIC16LC622A-04E/P - 4MHz 8-Bit OTP MCU, 3.5KB EPROM | Microchip
PIC16LC622A-04E/P

PIC16LC622A-04E/P - 4MHz 8-Bit OTP MCU, 3.5KB EPROM | Microchip

The Microchip Technology PIC16LC622A-04E/P is a low-power, EPROM-based 8-bit CMOS microcontroller in the PIC16C family, offering 4MHz maximum clock speed, 3.5KB (2K x 14) of One-Time Programmable program memory, 128 bytes of RAM, and 13 general-purpose I/O pins in an 18-pin PDIP package. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/EPROM/Flash), data memory (RAM), and configurable peripheral I/O. MCUs fall within the broader taxonomy of embedded processors -> microcontrollers -> 8-bit microcontrollers -> CMOS microcontrollers -> EPROM-based microcontrollers. The PIC16LC622A belongs to Microchip's PIC16C mid-range family, designed for cost-sensitive embedded control applications where code is finalized in production and re-programming is not required. Key features include a 12-bit wide instruction set with 8-bit wide data path, single-cycle instruction execution (200ns at 20MHz, with a 4MHz grade offered here), 35 single-word instructions to learn, a two-level deep hardware stack, and seven or eight special function hardware registers. The device supports direct, indirect, and relative addressing modes, runs from a 2.5V to 6.25V supply, and is targeted at the automotive operating range. Architecture-wise, the PIC16LC622A employs a RISC-based Harvard architecture with separated program and data buses, allowing simultaneous instruction fetch and data access. Its EPROM program memory is windowed for prototype erasure, supporting iterative development before OTP production programming. The 4MHz grade corresponds to a 1us instruction cycle when using the internal oscillator divider chain. Typical applications include automotive body controllers, simple sensor interfaces, low-speed communication bridges, and industrial control logic where field-programmability is unnecessary. The 18-pin PDIP through-hole package supports breadboard prototyping and legacy board designs. When designing with this part, note that the 'E' suffix indicates the extended automotive temperature range (-40C to +125C), and the '04' suffix denotes the 4MHz speed grade. EPROM-based PICs require UV erasure for reprogramming, so choose PIC16F-series Flash parts if in-field updates are required. This page synthesizes distributor pricing from DigiKey and Octopart, pin-compatible PIC16C-family alternatives, and practical design notes not consolidated in the manufacturer datasheet alone.

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PIC16LC622A-04E/SO - 8-bit 4MHz OTP MCU 3.5KB | Microchip
PIC16LC622A-04E/SO

PIC16LC622A-04E/SO - 8-bit 4MHz OTP MCU 3.5KB | Microchip

The Microchip Technology PIC16LC622A-04E/SO is an 8-bit EPROM/OTP-based CMOS microcontroller from the PIC16C family, operating at 4 MHz with 3.5 KB (2K x 14) of program memory, 128 bytes of RAM, and 13 I/O pins, packaged in an 18-pin SOIC. According to the manufacturer datasheet, the device executes 35 single-cycle instructions at 200 ns per cycle (except program branches which are two-cycle), supports 3.3V/5V operation, and integrates brown-out detection and a watchdog timer for enhanced system reliability in embedded applications. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/EPROM/Flash), data RAM, I/O peripherals, and timers onto one die. MCUs sit at the bottom of the compute hierarchy above discrete logic but below microprocessors (MPUs) and microcontrollers with embedded radios (SoCs). The PIC16C family uses a RISC-style Harvard architecture that delivers deterministic instruction timing and very low power consumption, making this category ideal for cost-sensitive, real-time, and battery-powered embedded designs. Key features include 13 bidirectional I/O pins with individual direction control, a 4 MHz maximum clock input, on-chip oscillator support (RC and crystal modes), a programmable watchdog timer with on-chip RC oscillator, power-saving SLEEP mode, and an operating voltage range compatible with both 3.3V and 5V rails. The 18-SOIC package provides a 7.50 mm body width with a 0.295 inch lead pitch suitable for hand-solderable prototyping as well as high-volume SMT production. Architecturally, the PIC16LC622A uses a 14-bit instruction word with an 8-bit data path, providing a code density advantage over many 8-bit competitors. The integrated brown-out reset (BOR) circuitry holds the MCU in reset when VDD falls below a programmable threshold, preventing code corruption from indeterminate supply voltage. The 35-instruction RISC core enables rapid development since most applications can be written using only a subset of the instruction set. Typical applications include appliance control, automotive body electronics, industrial sensor interfaces, remote controls, security and alarm panels, and low-cost consumer electronics. The combination of OTP program memory (cost-optimized for production) and wide voltage tolerance makes this part particularly attractive for high-volume, fixed-function devices where software is finalized and code security is required. When designing with this part, ensure that the MCLR (master clear) pin has a proper pull-up network for reliable reset behavior and that decoupling capacitors (100 nF ceramic plus bulk) are placed within a few millimeters of the VDD pin. The E suffix denotes the extended industrial temperature grade (-40C to +125C), which must be respected when specifying this part for harsh-environment deployments. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet, providing an information-gain view for procurement and engineering teams.

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PIC16LC622A-04E/SS - 4MHz 8-bit OTP MCU 3.5KB | Microchip
PIC16LC622A-04E/SS

PIC16LC622A-04E/SS - 4MHz 8-bit OTP MCU 3.5KB | Microchip

The Microchip Technology PIC16LC622A-04E/SS is an EPROM-based 8-bit CMOS microcontroller from the PIC16C family, delivering 4 MIPS performance at 4 MHz maximum clock speed. It integrates 3.5 KB of One-Time Programmable (OTP) program memory organized as 2K x 14 words and 128 bytes of data RAM, packaged in a 20-pin SSOP (Shrink Small Outline Package) suitable for space-constrained surface-mount designs. The device supports 13 general-purpose digital I/O pins and operates from a 2.5 V to 5.5 V supply rail, with an LC (low-power CMOS) process variant optimized for battery-sensitive applications. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral interfaces on one die. Within the broader taxonomy, PIC microcontrollers sit under the microcontrollers hierarchy, which itself belongs to integrated circuits and semiconductor devices. The PIC16C family specifically uses a Harvard RISC architecture with separate program and data buses, 12-bit or 14-bit wide instructions, and an 8-bit data path, enabling deterministic instruction execution in a single cycle except for program branches. Key features of the PIC16LC622A-04E/SS include a two-level deep hardware stack, direct/indirect/relative addressing modes, seven or eight special-function hardware registers, and an integrated watchdog timer for reliable operation in electrically noisy environments. The wide 2.5 V to 5.5 V supply range allows direct connection to 3.3 V and 5 V rails without level translation, while the -40 °C to +125 °C automotive operating range qualifies it for harsh-environment deployments. The LC process variant is engineered for low-power operation, drawing microamp-range supply current in sleep mode, which is critical for battery-powered or energy-harvesting endpoints. Its OTP program memory is one-time programmable but retains firmware permanently, providing field security without external memory components. The 20-pin SSOP package reduces board area versus the 28-pin and 40-pin PIC16 siblings while preserving the core peripheral set. Typical applications include low-power embedded control nodes, automotive body electronics, sensor signal conditioning, appliance control boards, and simple user-interface controllers. It is also well suited to industrial monitoring and remote-control subsystems that demand a small footprint and a wide supply tolerance. Designers should note that the OTP memory cannot be reprogrammed, so a flash-based PIC16F equivalent is preferred for prototyping and field-updateable deployments.

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PIC16LC622A-04I/SS - 8-bit PIC MCU 3.5KB OTP 20-SSOP | Microchip
PIC16LC622A-04I/SS

PIC16LC622A-04I/SS - 8-bit PIC MCU 3.5KB OTP 20-SSOP | Microchip

The Microchip Technology PIC16LC622A-04I/SS is an EPROM-based 8-bit CMOS microcontroller from the PIC16C family, delivering 4 MHz CPU performance with 3.5 KB (2K x 14) of One-Time-Programmable (OTP) program memory in a 20-pin SSOP package. The device features a RISC architecture with only 35 single-cycle instructions (200 ns instruction cycle at 20 MHz max clock input), 128 bytes of RAM, and 13 digital I/O pins. It operates from a 2.5 V to 6.25 V supply, drawing very low quiescent current suitable for line-powered and battery-backed designs. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral I/O onto one piece of silicon. Within the broader taxonomy, the PIC16C622A sits in the 8-bit MCU class, under the PIC16 mid-range family, within Microchip's PIC microcontroller portfolio. The 'LC' prefix indicates the low-power CMOS process variant, optimized for low operating current and extended power-rail tolerance, while the 'A' suffix denotes the enhanced silicon revision offering 2 KB of program memory (versus 1 KB on the original PIC16C622) and eight-level hardware stack. Key features include a two-level hardware stack (the 'A' revision extends to eight levels), direct/indirect/relative addressing modes, 12-bit-wide instructions with an 8-bit-wide data path, an integrated power-on reset, watchdog timer, and a brown-out detect circuit. The device supports both internal and external oscillator modes and includes a capture/compare/PWM module plus an 8-bit timer/counter, enabling timer-driven sequencing, event capture, and pulse-width-modulated outputs. The industrial-grade 'I' temperature range covers -40°C to +85°C. Typical applications span consumer appliance controllers, simple sensor signal conditioning front-ends, low-cost remote controls, automotive interior modules (non-safety), battery chargers, and general-purpose embedded control where deterministic single-cycle instruction execution and a minimal instruction set are valued. The wide 2.5 V to 6.25 V supply tolerance also makes the part practical for 3.3 V and 5 V mixed-rail systems. Designers should plan for a brown-out-reset capacitor on the MCLR/Vpp pin and account for the 200 ns instruction cycle when computing loop timing. Because the part is OTP, firmware must be fully validated before programming. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes that complement the manufacturer datasheet.

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PIC16LC622AT-04/SO - 8-bit OTP MCU, 3.5KB, 4MHz | Microchip
PIC16LC622AT-04/SO

PIC16LC622AT-04/SO - 8-bit OTP MCU, 3.5KB, 4MHz | Microchip

The Microchip Technology PIC16LC622AT-04/SO is an 8-bit RISC microcontroller from the PIC16C family with 3.5KB (2K x 14) of One-Time Programmable (OTP) program memory and 128 bytes of RAM, housed in an 18-pin SOIC (SO) package. Operating from a 2.5V to 6.0V supply at a 4MHz clock, the device targets low-power, deterministic embedded designs requiring small memory footprint and thirteen general-purpose I/O pins. A microcontroller (MCU) is a single-chip computer integrating a CPU core, program memory, working RAM, and peripheral I/O onto one die. The PIC16C family uses Microchip's enhanced Harvard RISC architecture, where program and data buses are physically separated, allowing instruction fetch to occur in parallel with operand reads and giving deterministic interrupt response. PIC microcontrollers belong to the broader class of 8-bit embedded microcontrollers within the semiconductor hierarchy of integrated circuits, and they are widely adopted in commercial and industrial control applications for their simple toolchain and low system cost. Key features include thirteen digital I/O pins, two 8-bit timers with optional 16-bit mode, a Watchdog Timer with on-chip RC oscillator, power-on reset, power-saving SLEEP mode, and an internal/external oscillator select. The 'LC' suffix denotes the low-voltage CMOS process, while the 'A' indicates the silicon revision and the 'T' indicates tape-and-reel packaging. The '04' speed grade corresponds to the 4MHz oscillator limit. The OTP program memory allows one-time programming during production. Architecture depth: the PIC16C62x devices implement a 14-bit instruction word with an 8-level hardware stack, supporting direct, indirect, and relative addressing modes. Brown-out Reset and Power-on Reset are integrated. The I/O ports are bidirectional with weak pull-up options on PORTB. An 8-bit prescaler is shared between Timer0 and the Watchdog Timer. Typical applications include appliance control, sensor signal conditioning front-ends, low-cost consumer products, industrial logic replacement, and battery-powered instrumentation. The SOIC-18 package supports hand-soldered prototypes and high-density SMT production lines alike. Designers should verify that the 2.5V-6.0V supply range matches the system rail, and confirm that the 13 I/O pins are sufficient before committing. OTP memory is one-time programmable, so firmware must be 100% validated before the production run. This page synthesizes distributor pricing from Mouser, DigiKey, and LCSC, plus drop-in alternative MPNs from the Microchip PIC16C family and practical design notes not consolidated on any single distributor page.

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PIC16LC622AT-04E/SS - 8-Bit 4MHz OTP MCU 3.5KB | Microchip
PIC16LC622AT-04E/SS

PIC16LC622AT-04E/SS - 8-Bit 4MHz OTP MCU 3.5KB | Microchip

The Microchip Technology PIC16LC622AT-04E/SS is an EPROM-based 8-bit CMOS microcontroller from the PIC16C family, featuring 3.5KB (2K x 14) of one-time programmable (OTP) program memory, 4 MHz maximum clock speed, and 12 I/O ports in a 20-pin SSOP surface-mount package. It operates from a 2.5V to 5.5V supply (with 2.5V to 6.25V maximum ratings per Microchip datasheet DS30261 family documentation) across an automotive temperature range of -40C to +125C, drawing low current suitable for battery-backed applications. The device belongs to the LC (low-power CMOS) process variant of the PIC16C62x series. An 8-bit microcontroller (MCU) is a programmable single-chip computer that combines a CPU, program memory, data memory, and peripherals on a single silicon die. Within the broader taxonomy, 8-bit MCUs sit below 16-bit and 32-bit microcontrollers in compute capacity but offer deterministic instruction timing, ultra-low cost, and minimal power consumption, making them ideal for cost-sensitive embedded control. The PIC architecture uses a Harvard design with separate program and data buses, a RISC instruction set, and a two-level hardware stack. The PIC16C family specifically targets OTP and EPROM devices for low-volume production runs and legacy designs. Key features include 128 bytes of RAM, 12 CMOS bidirectional I/O pins, two 8-bit timers and one 16-bit timer/counter, a watchdog timer with its own on-chip RC oscillator, power-on reset, brown-out reset, and an internal RC oscillator for reliable startup. The 4 MHz instruction rate delivers 1 MIPS performance, sufficient for slow-loop control, simple sensor interfaces, and user-interface logic. The SSOP-20 footprint (0.209 inch / 5.30 mm body width) is a standard 0.65 mm pitch package compatible with hand-soldering and reflow processes. The PIC16LC622A's architecture is built on Microchip's low-power CMOS process, enabling the LC suffix that distinguishes it from standard PIC16C622A parts. Its RISC core executes 35 single-word instructions in a single instruction cycle (4 clock periods), and the device supports direct, indirect, and relative addressing modes. The integrated watchdog timer with dedicated clock source provides failsafe operation independent of the main oscillator. Typical applications include industrial automation control, consumer electronics user interfaces, low-cost sensor signal conditioning, medical device sub-systems, and automotive body electronics. The wide operating temperature range makes it suitable for under-hood and outdoor installations. Because the part is OTP, it is most cost-effective for low-volume production or legacy migration designs. When designing with this device, ensure the OTP programming step is accounted for in the manufacturing flow, and verify brown-out reset thresholds match the supply voltage profile. The two-level hardware stack constrains nested subroutine depth, so architects must plan call chains carefully. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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